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  1. #1
    Jr. Apprentice
    Join Date
    Aug 2007
    Location
    No. central Arkansas
    Posts
    19

    Default 07 5.3 flex fuel - engine oil

    Owners Manual states that ONLY 5w-30 weight oil is to be used in this engine. Never seen this limitation before. Guess it has to do with the aluminum engine block or something. Anyone know why?

    P.S. 07 1500 Suburban 4x4.
    Mike

  2. #2

    Default

    I read a bit about it. I think there are several reasons, but I don't recall off the top of my head.

    Steve
    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

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  3. #3
    Jr. Mechanic
    Join Date
    Sep 2007
    Location
    Los Angeles, CA
    Posts
    116

    Default

    The newer engines, having tighter tolerances, require thinner oils. It has to do with the newer, more precise manufacturing technologies, and the fact that thinner oils help better fuel economy. My Bimmer, for example, require 0w-20. I don't know if your truck requires it or not, but I would definitely use synthetic oil!!

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